Mathematics – Logic
Scientific paper
Jul 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961natur.191..482d&link_type=abstract
Nature, Volume 191, Issue 4787, pp. 482 (1961).
Mathematics
Logic
2
Scientific paper
IN a recent article1 Prof. H. Pettersson describes his investigations of samples of deep-sea deposits in which were found metallic spherules, mostly less than 250µ in diameter, to which it is reasonable to ascribe a meteoric origin. These occurred in several geographical regions and in layers of various geological ages, and among the conclusions reached is the following : ``In general, the number of spherules is greatest in the more recent sediments. Nevertheless, substantial numbers of spherules were found in layers of Tertiary age : this contradicts the assertion made by some authorities that no meteors fell on the Earth during that time''. A reference identifies the ``authorities'' mentioned as the late Prof. F. A. Paneth, who, in a paper in Vistas in Astronomy2, wrote : ``The result of our discussion is that glass meteorites fell on our Earth only during the late Tertiary and early Quaternary ; that iron and stone meteorites did not fall before the late Quaternary ; that centuries ago the fall of iron meteorites was a much more common phenomenon than to-day ; and that even since 1800 meteorite falls seem to have become noticeably rarer''.
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